Pulsating screen for pulp and the like.



T. QVILLER. PULSATING SCREEN FOR PULP AND THE LIKE.

APPLICATION FILED AUG-4, 1915.

Patented Mar. 14, 1916.

THE COLUMBIA PLANOGRAPH co.. WASHINGTON, D. c.

THEODOR QVILLER, 0F LILLESTBGMMEN, NEAR CHRISTIANIA, NORWAY.

PULSAIING- SCREEN FOR PULP AND THE LIKE.

. Specification of Letters Batent. I V Patented M31314, 1916.

Application filed August 4, 1915. Serial No. 43,619.

To all 1072107721 it may concern:

Be it known that I, THEODOR Qvnmnn, a subject of the King of Norway, residing at Lillestrommen, near Christiania, Norway, have invented certain new and useful In1- provements in Pulsating Screens for Pulp and the like; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My present invention relates to improvements in pulsating screens for pulp and the like particularly of the type described in my prior Letters Patent No. 1124802.

The chief object of my invention is to provide a pulsating screen of the kindreferred to with means for removing coarse particles and waste accumulating on the screen cylinder so that said coarse particles will not obstruct the slots in the screening cylinder and prevent the same from acting on the fresh pulp fed into the apparatus.

The invention also has for its object to simplify the construction of the apparatus shown in my said prior patent. V

In the accompanying drawings: Figure 1 is a section on the line a, aof Fig. 2. Fig. 2 is an axial vertical section of the screening apparatus. Fig. 3 is an end view of the same. Fig. 4 is a cross section through the screening cylinder and the interior parts of the apparatus on the line 7), 7) of Fig. 2. Fig. 5 is a vertical axial section on a larger scale through one end of the apparatus illustrating the packing for cylinder.

2 designates a screen which is formed as a cylinder and is almost completely submerged in the pulp which is introduced at 1 so that only a small part of the screen projects above the pulp. Inside the screening cylinder two other rotating cylinders 4, are mounted on the same shaft with a short space between their adjacent ends, in which in the end walls of cylinders 4 adjacent to A the guide vanes 17 so that the pulp can pass the screening into the cylinders 4 between the guide vanes 17 and through the said openings 21. The rotating cylinders 4 are provided with peripheral openings 22 and with internal radial pump blades16 for causing the pulp to be driven out of said openings 22 by means of centrifugal force. In this way pressure is produced in the chambers 3 be lying in the feature that the cylinders 4 act as pumps, while in my Patent No. 1124802 a separate pump had to be provided for producing suction and pressure in the screening chambers. The opposite walls of the cylinders 4 are provided with covering plates 5 having openings 10 for letting out the screened pulp from the apparatus. The said covering plates may preferably be adjustable so as to permit a regulation of the openingsv 10. An outlet 18 (see Fig. 3) is pulp provided for letting out the screened from the end chambers.

The receptacle inclosing the screening cylinder is provided with removal side covers 19, 20, and its bottom has openings 30, by means of which it communicates with. the tubular chamber 31 provided with the outlet 11, which may be adapted to be closed by means of a valve or the like. ers 15 of the receptacle inclosing the screening cylinders are provided with cleaning openings, which are normally kept closed by means of covers 25.

The screening cylinder is provided on its outer periphery with angular longitudinal ribs 12, and the cylinder ends are provided with radial flanges 13, having openings 8 in front of each rib 12. Packing ribbons 23 are provided between the stationary recepta- The end covcle end walls and the ends of the screening cylinder.

The screening cylinder is provided with cylindrical extensions 14 by means of which it is rotatably mounted as shown on Fig. 2 on inwardly projecting circular flanges 32 on the end covers 15.

- The screening cylinder may be rotated in any convenient manner, but preferably as shown on Fig. 3 by, meansofaneccentric 29 on ashait 33 and'actuating pawl27 so as to drive a ratchet wheel 34 connected with said cylinder.

The mounting of the screening cylinder on the flanges 82 is shown on a larger scale in Fig. 5. on its outside by a rubber ring 36, which may be fastened by means of copper wire or the like 37 and is inclosed by a leather ring 38, also fastened by means of copper wire 39 on one side. Water under pressure is led into the annular channel 35 through the tube40, so that pressure is produced in the same, and the leather ring 38 is pressed against the inside of the extension 14.

There is also provided an outlet ll from the annular chamber 35, and the pressure in said chamber may be regulated by means of cocks or valves in the inlet and outlet.

The operation of the apparatus is substantially the same as of the apparatus de scribed in my prior Patent No. 1124802. The mass let in at 1 passes downwardly along one side of the screening cylinder. lVhile the fine particles are sucked through the screen, the coarse particles will be taken up by the ribs 12 to the part of the screening cylinder projecting above the pulp mass, and at this point the said particles are subjected to the action of a shower pipe 26 which acts to drive the said particles throughthe openings 8 in the flanges 13 to outlets 7, non-return clappers 28 or the like being provided in front of the said outlets '7 inorder to prevent the coarse particles from returning into the screening receptacle.-

As the ribs 12 for practical reasons cannot be made to cover the whole space'between the screening cylinder and the receptacle some coarse particles will always be left at the 'bottom of the receptacle, and 'saidparticles arelet out through the-outlet 11.

All the coarse particles ejected from thecopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents An annular channel 35 is covered apparatus are led to an auxiliary screening chamber, where thewaste is expelled, whlle the finer particles are brought back to'the viding the latter into several sections, and

a rotating member adapted to expose the several sections of the screen alternately to the action of pressure and suction channels.

2. In pulsating screens fol-pulp and the like a rotating screening cylinder, longitudinal radial ribs inside said cylinder dividing the latter into several chambers, two rotating cylinders mounted inside and coaxially' with the same, and having inlet openings at their adjacent ends, pump blades between the radial ribs inside the cylinders, said screening cylinder having rows of outlet openings-intermediate said ribs.

3. Inpulsating screens for pulp and the like a receptacle for pulp mass, a rotating screening cylinder inside-said receptacle and almost submerged in the pulp, longitudinal ribs outside the screening cylinder for taking with them coarse particles, flanges at the ends of said screening cylinder having openings adjacent to said ribs, and a shower pipe above the screening cylinder for ejecting the coarse particles from the same.

In testimony that I claim the foregoingas my invention, I have signed my name in presence of two subscribing witnesses.

THEODOR QVILLER.

Witnesses CL FABRIOIUS -Hansnn, Lnvr- M. Pownnsz Washington, 13.0. 

